Properties of quartz sight glass
Poisson's ratio: when the object is elongated, the transverse contraction appears in the direction perpendicular to the elongated direction. The relative elongation value is l/l, and the relative transverse shrinkage value Delta d/d, ratio between the two is called Poisson ratio = (delta d/d): (l/l).
Elastic modulus (modulus of elasticity, Young's modulus): the ratio of stress to strain. For example, a material constant that accords with Hooke's law and expresses stress and strain ratio in elastic range when it is subjected to axial tension or pressure is elastic constant, E= sigma / E.
Compression limit: the compression stress that can cause the vitreous body is called the anti compression limit of the sight glass.
Tensile limit: the tensile stress that can cause the vitreous body is called the tensile limit (or the tensile limit) of the sight glass.
The theoretical strength of quartz sight glass is generally far higher than that of its actual strength. For example, the tensile limit, the theoretical calculation is 246 x 103 kg / cm 2, and the actual about 500 kg / cm 2. This is mainly due to the existence of some defects in the processed quartz sight glass. For example, surface microcracks, bubbles, impurities, and stress are not.
The mechanical properties of the quartz sight glass is better than hard sight glass and ceramics, the new pull defect free quartz sight glass fiber strength is 24100 * 106 PA, small diameter quartz tube and quartz sight glass equipment can withstand great pressure, such as macroscopic defects of quartz sight glass products, such as residual bubbles, impurities and foreign melting is uneven and there the stress will affect the strength of the.
The strength of quartz sight glass begins with temperature and reaches a certain temperature, but increases with temperature. The quartz sight glass rises from room temperature to 900oC, and the tensile strength is about twice, and the impact strength shows great value.

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